Question

College Smokers

We are interested in estimating the proportion of students at a
university who smoke. Out of a random sample of 200 students from
this university, 47 students smoke.

(a) Calculate a 97% confidence interval for the proportion of
students at this university who smoke.

( , )

(b) If we wanted the margin of error to be no larger than 2% at a
97% confidence level for the proportion of students who smoke, how
big of a sample would we need?

*n*=

.

Answer #1

We are interested in estimating the proportion of graduates at a
mid-sized university who found a job within one year of completing
their undergraduate degree. Suppose we conduct a survey and find
out that 347 of the 400 randomly sampled graduates found jobs. The
graduating class under consideration included over 4500
students.
(a) Consider the population parameter of interest. What is the
value of the point estimate of this parameter? 4500
(b) Check if the conditions for constructing a confidence...

A researcher in a small town is interested in estimating the
true proportion of adults in the town who smoke. 215 adults were
randomly selected from the town, and it was found that 36 of them
smoke. We would like to construct a 90% confidence interval
estimate for the true proportion of adults in the town that smoke.
please show work! thanks.
What are the values of, ,
and (Round and to three decimal
places if needed.)
=
_______________ =
_______________
=
_______________ =
_______________...

1. A university Dean is interested in determining the proportion
of students who receive
some sort of financial aid. Rather than examine the records for all
students, the dean randomly selects
200 students and finds that 118
of them are receiving financial aid. By hand, and using formulas
for the
“Margin of Error” (i.e. not calculator confidence interval), find a
98% confidence interval to estimate
the true proportion of students on financial aid. (Use 3 decimal
places for proportions.)
2....

You want to estimate the proportion of students at your college
or university who are employed for 10 or more hours per week while
classes are in session. You plan to present your results by a 95%
confidence interval. Using the guessed value p* = 0.32,
find the sample size required if the interval is to have an
approximate margin of error of m = 0.04.

Administrators at A&M Texas university were interested in
estimating the percentage of students who are the first in their
family to go to college. For each scenario below, identify the type
of sample used by the university administrators. Possible answers
include simple random sample, systematic sample, stratified sample,
cluster sample, census, voluntary response sample, and convenience
sample. a) using a computer based list of registered students,
select one of the first 25 on the list by random and then contact...

A university dean is interested in determining the proportion of
students who receive some sort of financial aid. Rather than
examine the records for all students, the dean randomly selects 200
students and finds that 122 of them are receiving financial aid.
Use a 95% confidence interval to estimate the true proportion of
students who receive financial aid.

A study was conducted to compare the proportion of smokers under
20 to the proportion of middle age smokers. A sample of 200 people
under 20 had 56 smokers. A sample of 175 middle age
smokers showed 55 smokers. Is there a difference in the proportion
of under 20 and middle age people who smoke? Use the confidence
interval approach to test the claim. Find the 97% confidence
interval for the difference of the two proportions. State the
hypotheses and identify...

A university dean is interested in determining the proportion of
students who receive some sort of financial aid. Rather than
examine the records for all students, the dean randomly selects 200
students and finds that 118 of them are receiving financial aid.
Use a 98% confidence interval to estimate the true proportion of
students on financial aid.

A researcher wanted to estimate the true proportion of smokers
in a certain city (?). He selected a random sample of size ? = 50
people and found 15 smokers in the sample. a) Find a point estimate
for (?). b) Find a 95% confidence interval for (?). c) If we use
the sample proportion (?̅) to estimate (?), calculate the margin of
error using the confidence level 0.95

Suppose a seed distributor is interested in estimating the
proportion of a certain type of beet seeds that will germinate. How
large of a sample size is required if they wanted to estimate this
proportion with a 88% confidence interval and a margin of error of
0. 03? Assume that the distributor does not have any prior
knowledge of this proportion.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 3 minutes ago

asked 8 minutes ago

asked 8 minutes ago

asked 9 minutes ago

asked 19 minutes ago

asked 22 minutes ago

asked 22 minutes ago

asked 22 minutes ago

asked 23 minutes ago

asked 25 minutes ago

asked 30 minutes ago